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scsi: mvsas: mv_sas.c: Fix for possible null pointer dereference 

There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Rickard Strandqvist 2014-05-18 18:12:26 +02:00 committed by Jiri Kosina
parent 305af08c53
commit eaa015d2bf
1 changed files with 14 additions and 10 deletions
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24
drivers/scsi/mvsas/mv_sas.c
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@ -1344,19 +1344,23 @@ void mvs_dev_gone_notify(struct domain_device *dev)
{
unsigned long flags = 0;
struct mvs_device *mvi_dev = dev->lldd_dev;
struct mvs_info *mvi = mvi_dev->mvi_info;
struct mvs_info *mvi;
if (!mvi_dev) {
mv_dprintk("found dev has gone.\n");
return;
}
mvi = mvi_dev->mvi_info;
spin_lock_irqsave(&mvi->lock, flags);
if (mvi_dev) {
mv_dprintk("found dev[%d:%x] is gone.\n",
mvi_dev->device_id, mvi_dev->dev_type);
mvs_release_task(mvi, dev);
mvs_free_reg_set(mvi, mvi_dev);
mvs_free_dev(mvi_dev);
} else {
mv_dprintk("found dev has gone.\n");
}
mv_dprintk("found dev[%d:%x] is gone.\n",
mvi_dev->device_id, mvi_dev->dev_type);
mvs_release_task(mvi, dev);
mvs_free_reg_set(mvi, mvi_dev);
mvs_free_dev(mvi_dev);
dev->lldd_dev = NULL;
mvi_dev->sas_device = NULL;