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Commit 9bd9c9ba authored by Sujit Reddy Thumma's avatar Sujit Reddy Thumma
Browse files

scsi: ufs: retry if host reset fails 



SCSI error handling mechanism offlines the device if the host
reset fails and the device is never recovered until a reboot.
Hence, instead of giving up on first host reset failure, retry
few more times to see if the link can be recovered.

Change-Id: I16d5c16b34f691135feb8cce0ec20520573011b9
Signed-off-by: default avatarSujit Reddy Thumma <sthumma@codeaurora.org>
parent bfc96c5e

drivers/scsi/ufs/ufshcd.c

+7 −1
Original line number Diff line number Diff line
@@ -81,6 +81,9 @@ 
/* maximum number of link-startup retries */

#define DME_LINKSTARTUP_RETRIES 3



/* maximum number of reset retries before giving up */

#define MAX_HOST_RESET_RETRIES 5



/* Expose the flag value from utp_upiu_query.value */

#define MASK_QUERY_UPIU_FLAG_LOC 0xFF
@@ -3592,8 +3595,11 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba) 
{

	int err = 0;

	unsigned long flags;

	int retries = MAX_HOST_RESET_RETRIES;



	do {

		err = ufshcd_host_reset_and_restore(hba);

	} while (err && --retries);



	/*

	 * After reset the door-bell might be cleared, complete