Fix for dead lock occurring between host_lock and sas_device_lock.
The deadlock is between two spin locks, between the shost->host_lock
and driver ioc->sas_device_lock.
The fix is to rearrange the code in the FW/Driver device removal
handshake so the ioc->sas_device_lock is not occurring when the
shost->host_lock is taken.
Signed-off-by: Nagalakshmi Nandigama <nagalakshmi.nandigama@xxxxxxx>
---
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index a84bde8..ea5e151 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -3017,7 +3017,8 @@ _scsih_tm_tr_send(struct MPT2SAS_ADAPTER *ioc, u16 handle)
Mpi2SCSITaskManagementRequest_t *mpi_request;
u16 smid;
struct _sas_device *sas_device;
- struct MPT2SAS_TARGET *sas_target_priv_data;
+ struct MPT2SAS_TARGET *sas_target_priv_data = NULL;
+ u64 sas_address;
unsigned long flags;
struct _tr_list *delayed_tr;
u32 ioc_state;
@@ -3050,13 +3051,17 @@ _scsih_tm_tr_send(struct MPT2SAS_ADAPTER *ioc, u16 handle)
sas_device->starget->hostdata) {
sas_target_priv_data = sas_device->starget->hostdata;
sas_target_priv_data->deleted = 1;
- dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
- "setting delete flag: handle(0x%04x), "
- "sas_addr(0x%016llx)\n", ioc->name, handle,
- (unsigned long long) sas_device->sas_address));
+ sas_address = sas_device->sas_address;
}
spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
+ if (sas_target_priv_data) {
+ dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "setting delete flag: "
+ "handle(0x%04x), sas_addr(0x%016llx)\n", ioc->name, handle,
+ (unsigned long long)sas_address));
+ _scsih_ublock_io_device(ioc, handle);
+ }
+
smid = mpt2sas_base_get_smid_hpr(ioc, ioc->tm_tr_cb_idx);
if (!smid) {
delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
--
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