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aha1542: Allocate memory before taking a lock 

The driver currently calls kmalloc with GFP_KERNEL while holding a lock.
Fix it by doing the allocation earlier, before taking the lock.

Tested on AHA-1542B.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Ondrej Zary 2015-04-21 23:27:50 +02:00 committed by James Bottomley
parent 35e9a9f939
commit 8c08a6215a
1 changed files with 11 additions and 12 deletions
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23
drivers/scsi/aha1542.c
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@ -375,9 +375,10 @@ static int aha1542_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
u8 lun = cmd->device->lun;
unsigned long flags;
int bufflen = scsi_bufflen(cmd);
int mbo;
int mbo, sg_count;
struct mailbox *mb = aha1542->mb;
struct ccb *ccb = aha1542->ccb;
struct chain *cptr;
if (*cmd->cmnd == REQUEST_SENSE) {
/* Don't do the command - we have the sense data already */
@ -397,6 +398,13 @@ static int aha1542_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
print_hex_dump_bytes("command: ", DUMP_PREFIX_NONE, cmd->cmnd, cmd->cmd_len);
}
#endif
if (bufflen) { /* allocate memory before taking host_lock */
sg_count = scsi_sg_count(cmd);
cptr = kmalloc(sizeof(*cptr) * sg_count, GFP_KERNEL | GFP_DMA);
if (!cptr)
return SCSI_MLQUEUE_HOST_BUSY;
}
/* Use the outgoing mailboxes in a round-robin fashion, because this
is how the host adapter will scan for them */
@ -441,19 +449,10 @@ static int aha1542_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
if (bufflen) {
struct scatterlist *sg;
struct chain *cptr;
int i, sg_count = scsi_sg_count(cmd);
int i;
ccb[mbo].op = 2; /* SCSI Initiator Command w/scatter-gather */
cmd->host_scribble = kmalloc(sizeof(*cptr)*sg_count,
GFP_KERNEL | GFP_DMA);
cptr = (struct chain *) cmd->host_scribble;
if (cptr == NULL) {
/* free the claimed mailbox slot */
aha1542->int_cmds[mbo] = NULL;
spin_unlock_irqrestore(sh->host_lock, flags);
return SCSI_MLQUEUE_HOST_BUSY;
}
cmd->host_scribble = (void *)cptr;
scsi_for_each_sg(cmd, sg, sg_count, i) {
any2scsi(cptr[i].dataptr, isa_page_to_bus(sg_page(sg))
+ sg->offset);