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authorKrzysztof Helt <krzysztof.h1@wp.pl>2008-01-11 21:50:46 +0100
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-23 11:29:25 -0600
commitd9aa3af09cdc5d3ae0e67bed4107bcf7e25b9f31 (patch)
tree82d2699430907da4947022c406feabf855414bdf /drivers/scsi/sym53c8xx_2
parent3a0086a80ab7c2f1adb0e9b2a6fc82632979cec5 (diff)
[SCSI] sym53c8xx: fixes two bugs related to chip reset
This patch fixes two bugs pointed by James Bottomley: 1. the if (!sym_data->io_reset). That variable is only ever filled by a stack based completion. If we find it non empty it means this code has been entered twice and we have a severe problem, so that should just become a BUG_ON(sym_data->io_reset). 2. sym_data->io_reset should be set to NULL before the routine is exited otherwise the PCI recovery code could end up completing what will be a bogus pointer into the stack. Big thanks to James Bottomley for help with the patch. Signed-off-by: Krzysztof Helt <krzysztof.h1@w.pl> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/sym53c8xx_2')
-rw-r--r--drivers/scsi/sym53c8xx_2/sym_glue.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index 09bbb39efe8..dc9af8f8f26 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -609,22 +609,24 @@ static int sym_eh_handler(int op, char *opname, struct scsi_cmnd *cmd)
*/
#define WAIT_FOR_PCI_RECOVERY 35
if (pci_channel_offline(pdev)) {
- struct completion *io_reset;
int finished_reset = 0;
init_completion(&eh_done);
spin_lock_irq(shost->host_lock);
/* Make sure we didn't race */
if (pci_channel_offline(pdev)) {
- if (!sym_data->io_reset)
- sym_data->io_reset = &eh_done;
- io_reset = sym_data->io_reset;
+ BUG_ON(sym_data->io_reset);
+ sym_data->io_reset = &eh_done;
} else {
finished_reset = 1;
}
spin_unlock_irq(shost->host_lock);
if (!finished_reset)
- finished_reset = wait_for_completion_timeout(io_reset,
+ finished_reset = wait_for_completion_timeout
+ (sym_data->io_reset,
WAIT_FOR_PCI_RECOVERY*HZ);
+ spin_lock_irq(shost->host_lock);
+ sym_data->io_reset = NULL;
+ spin_unlock_irq(shost->host_lock);
if (!finished_reset)
return SCSI_FAILED;
}
@@ -1879,7 +1881,6 @@ static void sym2_io_resume(struct pci_dev *pdev)
spin_lock_irq(shost->host_lock);
if (sym_data->io_reset)
complete_all(sym_data->io_reset);
- sym_data->io_reset = NULL;
spin_unlock_irq(shost->host_lock);
}