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Commit da2907ff authored by Julia Lawall's avatar Julia Lawall Committed by James Bottomley
Browse files

[SCSI] dpt_i2o: Use GFP_ATOMIC when a lock is held 

The function adpt_i2o_post_wait is called from several places, in some of
which, such as adpt_abort, a lock may be held.

The functions adpt_i2o_reparse_lct and adpt_i2o_lct_get are called from
several places, including adpt_rescan where a lock may be held.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/

)

// <smpl>
@gfp exists@
identifier fn;
position p;
@@

fn(...) {
 ... when != spin_unlock_irqrestore
     when any
 GFP_KERNEL@p
 ... when any
}

@locked@
identifier gfp.fn;
@@

spin_lock_irqsave(...)
...  when != spin_unlock_irqrestore
fn(...)

@depends on locked@
position gfp.p;
@@

- GFP_KERNEL@p
+ GFP_ATOMIC
// </smpl>

Signed-off-by: default avatarJulia Lawall <julia@diku.dk>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent c0ff2775

drivers/scsi/dpt_i2o.c

+10 −5
Original line number Diff line number Diff line
@@ -1290,7 +1290,7 @@ static int adpt_i2o_post_wait(adpt_hba* pHba, u32* msg, int len, int timeout) 
	ulong flags = 0;

	struct adpt_i2o_post_wait_data *p1, *p2;

	struct adpt_i2o_post_wait_data *wait_data =

		kmalloc(sizeof(struct adpt_i2o_post_wait_data),GFP_KERNEL);

		kmalloc(sizeof(struct adpt_i2o_post_wait_data), GFP_ATOMIC);

	DECLARE_WAITQUEUE(wait, current);



	if (!wait_data)
@@ -2651,7 +2651,8 @@ static s32 adpt_i2o_reparse_lct(adpt_hba* pHba) 
				pDev = pDev->next_lun;

			}

			if(!pDev ) { // Something new add it

				d = kmalloc(sizeof(struct i2o_device), GFP_KERNEL);

				d = kmalloc(sizeof(struct i2o_device),

					    GFP_ATOMIC);

				if(d==NULL)

				{

					printk(KERN_CRIT "Out of memory for I2O device data.\n");
@@ -2673,7 +2674,9 @@ static s32 adpt_i2o_reparse_lct(adpt_hba* pHba) 
				}

				pDev = pHba->channel[bus_no].device[scsi_id];	

				if( pDev == NULL){

					pDev =  kzalloc(sizeof(struct adpt_device),GFP_KERNEL);

					pDev =

					  kzalloc(sizeof(struct adpt_device),

						  GFP_ATOMIC);

					if(pDev == NULL) {

						return -ENOMEM;

					}
@@ -2682,7 +2685,9 @@ static s32 adpt_i2o_reparse_lct(adpt_hba* pHba) 
					while (pDev->next_lun) {

						pDev = pDev->next_lun;

					}

					pDev = pDev->next_lun = kzalloc(sizeof(struct adpt_device),GFP_KERNEL);

					pDev = pDev->next_lun =

					  kzalloc(sizeof(struct adpt_device),

						  GFP_ATOMIC);

					if(pDev == NULL) {

						return -ENOMEM;

					}
@@ -3127,7 +3132,7 @@ static int adpt_i2o_lct_get(adpt_hba* pHba) 
		if (pHba->lct == NULL) {

			pHba->lct = dma_alloc_coherent(&pHba->pDev->dev,

					pHba->lct_size, &pHba->lct_pa,

					GFP_KERNEL);

					GFP_ATOMIC);

			if(pHba->lct == NULL) {

				printk(KERN_CRIT "%s: Lct Get failed. Out of memory.\n",

					pHba->name);