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usb-storage: make use of srb local variable 

Commit 8b52291a07 ("usb-storage: fix deadlock involving host lock
and scsi_done") added a local variable to usb_stor_control_thread() in
the usb-storage driver.  This local variable holds the value of
us->srb, for use after the host lock has been released.

But as long as we have the value in a local variable, we may as well
use it instead of dereferencing the us pointer all over the place.
This patch makes no functional change; it just makes the code a little
shorter and a little neater.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2017-10-25 10:40:05 -04:00 committed by Greg Kroah-Hartman
parent f93de0c27e
commit 32bf9fd50f
1 changed files with 17 additions and 17 deletions
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34
drivers/usb/storage/usb.c
View File

@ -332,7 +332,7 @@ static int usb_stor_control_thread(void * __us)
/* When we are called with no command pending, we're done */
srb = us->srb;
if (us->srb == NULL) {
if (srb == NULL) {
scsi_unlock(host);
mutex_unlock(&us->dev_mutex);
usb_stor_dbg(us, "-- exiting\n");
@ -341,7 +341,7 @@ static int usb_stor_control_thread(void * __us)
/* has the command timed out *already* ? */
if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
us->srb->result = DID_ABORT << 16;
srb->result = DID_ABORT << 16;
goto SkipForAbort;
}
@ -351,35 +351,35 @@ static int usb_stor_control_thread(void * __us)
* reject the command if the direction indicator
* is UNKNOWN
*/
if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
if (srb->sc_data_direction == DMA_BIDIRECTIONAL) {
usb_stor_dbg(us, "UNKNOWN data direction\n");
us->srb->result = DID_ERROR << 16;
srb->result = DID_ERROR << 16;
}
/*
* reject if target != 0 or if LUN is higher than
* the maximum known LUN
*/
else if (us->srb->device->id &&
else if (srb->device->id &&
!(us->fflags & US_FL_SCM_MULT_TARG)) {
usb_stor_dbg(us, "Bad target number (%d:%llu)\n",
us->srb->device->id,
us->srb->device->lun);
us->srb->result = DID_BAD_TARGET << 16;
srb->device->id,
srb->device->lun);
srb->result = DID_BAD_TARGET << 16;
}
else if (us->srb->device->lun > us->max_lun) {
else if (srb->device->lun > us->max_lun) {
usb_stor_dbg(us, "Bad LUN (%d:%llu)\n",
us->srb->device->id,
us->srb->device->lun);
us->srb->result = DID_BAD_TARGET << 16;
srb->device->id,
srb->device->lun);
srb->result = DID_BAD_TARGET << 16;
}
/*
* Handle those devices which need us to fake
* their inquiry data
*/
else if ((us->srb->cmnd[0] == INQUIRY) &&
else if ((srb->cmnd[0] == INQUIRY) &&
(us->fflags & US_FL_FIX_INQUIRY)) {
unsigned char data_ptr[36] = {
0x00, 0x80, 0x02, 0x02,
@ -387,13 +387,13 @@ static int usb_stor_control_thread(void * __us)
usb_stor_dbg(us, "Faking INQUIRY command\n");
fill_inquiry_response(us, data_ptr, 36);
us->srb->result = SAM_STAT_GOOD;
srb->result = SAM_STAT_GOOD;
}
/* we've got a command, let's do it! */
else {
US_DEBUG(usb_stor_show_command(us, us->srb));
us->proto_handler(us->srb, us);
US_DEBUG(usb_stor_show_command(us, srb));
us->proto_handler(srb, us);
usb_mark_last_busy(us->pusb_dev);
}
@ -401,7 +401,7 @@ static int usb_stor_control_thread(void * __us)
scsi_lock(host);
/* was the command aborted? */
if (us->srb->result == DID_ABORT << 16) {
if (srb->result == DID_ABORT << 16) {
SkipForAbort:
usb_stor_dbg(us, "scsi command aborted\n");
srb = NULL; /* Don't call srb->scsi_done() */