[SCSI] mvsas: fix hot plug handling and IO issues

This patch adds a bunch of fixes

1. Reduce sg table size to 64 (SG_MX) instead of default SG_ALL
2. clear task lists on phy down events
3. release all tasks on port deformation
4. release current task for device gone notification
5. Add sata abort handing
6. Add 10ms delay to each port reset (currently done serially and with
   interrupts disabled)

[jejb: whitespace fixes and clean ups plus added description
       added dummy 94xx_clear_srs_irq function just to prevent the
       mismatch in the mvs_dispatch structure killing 94xx cards]
Signed-off-by: Srinivas <satyasrinivasp@hcl.in>
Cc: Andy Yan <ayan@marvell.com>
Cc: qswang@marvell.com
Cc: jfeng@marvell.com
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/scsi/mvsas/mv_94xx.c b/drivers/scsi/mvsas/mv_94xx.c
index 0940fae19d20..eed4c5c72013 100644
--- a/drivers/scsi/mvsas/mv_94xx.c
+++ b/drivers/scsi/mvsas/mv_94xx.c
@@ -616,6 +616,15 @@ void mvs_94xx_fix_dma(dma_addr_t buf_dma, int buf_len, int from, void *prd)
 }
 #endif
 
+/*
+ * FIXME JEJB: temporary nop clear_srs_irq to make 94xx still work
+ * with 64xx fixes
+ */
+static void mvs_94xx_clear_srs_irq(struct mvs_info *mvi, u8 reg_set,
+                                   u8 clear_all)
+{
+}
+
 const struct mvs_dispatch mvs_94xx_dispatch = {
         "mv94xx",
         mvs_94xx_init,
@@ -640,6 +649,7 @@ const struct mvs_dispatch mvs_94xx_dispatch = {
         mvs_write_port_irq_mask,
         mvs_get_sas_addr,
         mvs_94xx_command_active,
+        mvs_94xx_clear_srs_irq,
         mvs_94xx_issue_stop,
         mvs_start_delivery,
         mvs_rx_update,