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Commit a53a21e4 authored by Finn Thain's avatar Finn Thain Committed by Christoph Hellwig
Browse files

atari_NCR5380: Move static co-routine variables to host data 



Unlike NCR5380.c, the atari_NCR5380.c core driver is limited to a single
instance because co-routine state is stored globally.

Fix this by removing the static scsi host pointer. For the co-routine,
obtain this pointer from the work_struct pointer instead. For the interrupt
handler, obtain it from the dev_id argument.

Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Tested-by: default avatarMichael Schmitz <schmitzmic@gmail.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 61d739a4

drivers/scsi/NCR5380.h

+2 −0
Original line number Diff line number Diff line
@@ -283,6 +283,8 @@ struct NCR5380_hostdata { 
	int read_overruns;                /* number of bytes to cut from a

	                                   * transfer to handle chip overruns */

	int retain_dma_intr;

	struct work_struct main_task;

	volatile int main_running;

#ifdef SUPPORT_TAGS

	struct tag_alloc TagAlloc[8][8];	/* 8 targets and 8 LUNs */

#endif

drivers/scsi/atari_NCR5380.c

+22 −39
Original line number Diff line number Diff line
@@ -221,9 +221,6 @@ 
 * possible) function may be used.

 */



static struct Scsi_Host *first_instance = NULL;

static struct scsi_host_template *the_template = NULL;



/* Macros ease life... :-) */

#define	SETUP_HOSTDATA(in)				\

    struct NCR5380_hostdata *hostdata =			\
@@ -595,32 +592,19 @@ static void NCR5380_print_phase(struct Scsi_Host *instance) 
#include <linux/workqueue.h>

#include <linux/interrupt.h>



static volatile int main_running;

static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);



static inline void queue_main(void)

static inline void queue_main(struct NCR5380_hostdata *hostdata)

{

	if (!main_running) {

	if (!hostdata->main_running) {

		/* If in interrupt and NCR5380_main() not already running,

		   queue it on the 'immediate' task queue, to be processed

		   immediately after the current interrupt processing has

		   finished. */

		schedule_work(&NCR5380_tqueue);

		schedule_work(&hostdata->main_task);

	}

	/* else: nothing to do: the running NCR5380_main() will pick up

	   any newly queued command. */

}





static inline void NCR5380_all_init(void)

{

	static int done = 0;

	if (!done) {

		dprintk(NDEBUG_INIT, "scsi : NCR5380_all_init()\n");

		done = 1;

	}

}



/**

 * NCR58380_info - report driver and host information

 * @instance: relevant scsi host instance
@@ -703,7 +687,7 @@ static void NCR5380_print_status(struct Scsi_Host *instance) 


	local_irq_save(flags);

	printk("NCR5380: coroutine is%s running.\n",

		main_running ? "" : "n't");

		hostdata->main_running ? "" : "n't");

	if (!hostdata->connected)

		printk("scsi%d: no currently connected command\n", HOSTNO);

	else
@@ -746,7 +730,7 @@ static int __maybe_unused NCR5380_show_info(struct seq_file *m, 


	local_irq_save(flags);

	seq_printf(m, "NCR5380: coroutine is%s running.\n",

		main_running ? "" : "n't");

		hostdata->main_running ? "" : "n't");

	if (!hostdata->connected)

		seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO);

	else
@@ -783,8 +767,7 @@ static int __init NCR5380_init(struct Scsi_Host *instance, int flags) 
	int i;

	SETUP_HOSTDATA(instance);



	NCR5380_all_init();



	hostdata->host = instance;

	hostdata->aborted = 0;

	hostdata->id_mask = 1 << instance->this_id;

	hostdata->id_higher_mask = 0;
@@ -805,10 +788,7 @@ static int __init NCR5380_init(struct Scsi_Host *instance, int flags) 
	hostdata->disconnected_queue = NULL;

	hostdata->flags = flags;



	if (!the_template) {

		the_template = instance->hostt;

		first_instance = instance;

	}

	INIT_WORK(&hostdata->main_task, NCR5380_main);



	prepare_info(instance);
@@ -829,7 +809,9 @@ static int __init NCR5380_init(struct Scsi_Host *instance, int flags) 


static void NCR5380_exit(struct Scsi_Host *instance)

{

	cancel_work_sync(&NCR5380_tqueue);

	struct NCR5380_hostdata *hostdata = shost_priv(instance);



	cancel_work_sync(&hostdata->main_task);

}



/**
@@ -924,9 +906,9 @@ static int NCR5380_queue_command(struct Scsi_Host *instance, 
	 * unconditionally, because it cannot be already running.

	 */

	if (in_interrupt() || irqs_disabled())

		queue_main();

		queue_main(hostdata);

	else

		NCR5380_main(NULL);

		NCR5380_main(&hostdata->main_task);

	return 0;

}
@@ -955,9 +937,10 @@ static inline void maybe_release_dma_irq(struct Scsi_Host *instance) 


static void NCR5380_main(struct work_struct *work)

{

	struct NCR5380_hostdata *hostdata =

		container_of(work, struct NCR5380_hostdata, main_task);

	struct Scsi_Host *instance = hostdata->host;

	struct scsi_cmnd *tmp, *prev;

	struct Scsi_Host *instance = first_instance;

	struct NCR5380_hostdata *hostdata = HOSTDATA(instance);

	int done;

	unsigned long flags;
@@ -982,9 +965,9 @@ static void NCR5380_main(struct work_struct *work) 
	   'main_running' is set here, and queues/executes main via the

	   task queue, it doesn't do any harm, just this instance of main

	   won't find any work left to do. */

	if (main_running)

	if (hostdata->main_running)

		return;

	main_running = 1;

	hostdata->main_running = 1;



	local_save_flags(flags);

	do {
@@ -1103,7 +1086,7 @@ static void NCR5380_main(struct work_struct *work) 
	/* Better allow ints _after_ 'main_running' has been cleared, else

	   an interrupt could believe we'll pick up the work it left for

	   us, but we won't see it anymore here... */

	main_running = 0;

	hostdata->main_running = 0;

	local_irq_restore(flags);

}
@@ -1215,7 +1198,7 @@ static void NCR5380_dma_complete(struct Scsi_Host *instance) 


static irqreturn_t NCR5380_intr(int irq, void *dev_id)

{

	struct Scsi_Host *instance = first_instance;

	struct Scsi_Host *instance = dev_id;

	int done = 1, handled = 0;

	unsigned char basr;
@@ -1287,7 +1270,7 @@ static irqreturn_t NCR5380_intr(int irq, void *dev_id) 
	if (!done) {

		dprintk(NDEBUG_INTR, "scsi%d: in int routine, calling main\n", HOSTNO);

		/* Put a call to NCR5380_main() on the queue... */

		queue_main();

		queue_main(shost_priv(instance));

	}

	return IRQ_RETVAL(handled);

}
@@ -1767,7 +1750,7 @@ static int NCR5380_transfer_pio(struct Scsi_Host *instance, 
 * Returns : 0 on success, -1 on failure.

 */



static int do_abort(struct Scsi_Host *host)

static int do_abort(struct Scsi_Host *instance)

{

	unsigned char tmp, *msgptr, phase;

	int len;
@@ -1802,7 +1785,7 @@ static int do_abort(struct Scsi_Host *host) 
	msgptr = &tmp;

	len = 1;

	phase = PHASE_MSGOUT;

	NCR5380_transfer_pio(host, &phase, &len, &msgptr);

	NCR5380_transfer_pio(instance, &phase, &len, &msgptr);



	/*

	 * If we got here, and the command completed successfully,

drivers/scsi/atari_scsi.c

+4 −4
Original line number Diff line number Diff line
@@ -110,7 +110,7 @@ 
#define NCR5380_dma_xfer_len(instance, cmd, phase) \

        atari_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO))



#define NCR5380_acquire_dma_irq(instance)      falcon_get_lock()

#define NCR5380_acquire_dma_irq(instance)      falcon_get_lock(instance)

#define NCR5380_release_dma_irq(instance)      falcon_release_lock()



#include "NCR5380.h"
@@ -468,15 +468,15 @@ static void falcon_release_lock(void) 
 * command immediately but tell the SCSI mid-layer to defer.

 */



static int falcon_get_lock(void)

static int falcon_get_lock(struct Scsi_Host *instance)

{

	if (IS_A_TT())

		return 1;



	if (in_interrupt())

		return stdma_try_lock(scsi_falcon_intr, NULL);

		return stdma_try_lock(scsi_falcon_intr, instance);



	stdma_lock(scsi_falcon_intr, NULL);

	stdma_lock(scsi_falcon_intr, instance);

	return 1;

}