mmc: omap: Fix NULL pointer dereference if mmc_omap_new_slot() fails

Commit b01a4f1c (mmc: omap: convert to per instance workqueue) initializes
the workqueue too late causing the following:

Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0    Not tainted  (3.4.0-08218-gb48b2c3 #158)
PC is at __queue_work+0x8/0x46c
LR is at queue_work_on+0x38/0x40
pc : [<c005bb4c>]    lr : [<c005c00c>]    psr: 60000193
sp : c0691e1c  ip : 00000000  fp : c07374ac
r10: c7aae400  r9 : c0395700  r8 : 00000100
r7 : c0691e70  r6 : 00000000  r5 : 00000000  r4 : c7aae440
r3 : 00000001  r2 : c7aae440  r1 : 00000000  r0 : 00000000
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 00c5387d  Table: 80004000  DAC: 00000017
Process swapper/0 (pid: 0, stack limit = 0xc06902f8)
Stack: (0xc0691e1c to 0xc0692000)

Fix this by initializing the workqueue before mmc_omap_remove_slot()
get called. Tested on n770, looks like n800 at least still has some
other issue with MMC.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index feda3064b2cd..6b07730598da 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -1485,24 +1485,27 @@ static int __devinit mmc_omap_probe(struct platform_device *pdev)
         }
 
         host->nr_slots = pdata->nr_slots;
+
+        host->mmc_omap_wq = alloc_workqueue("mmc_omap", 0, 0);
+        if (!host->mmc_omap_wq)
+                goto err_plat_cleanup;
+
         for (i = 0; i < pdata->nr_slots; i++) {
                 ret = mmc_omap_new_slot(host, i);
                 if (ret < 0) {
                         while (--i >= 0)
                                 mmc_omap_remove_slot(host->slots[i]);
 
-                        goto err_plat_cleanup;
+                        goto err_destroy_wq;
                 }
         }
 
         host->reg_shift = (cpu_is_omap7xx() ? 1 : 2);
 
-        host->mmc_omap_wq = alloc_workqueue("mmc_omap", 0, 0);
-        if (!host->mmc_omap_wq)
-                goto err_plat_cleanup;
-
         return 0;
 
+err_destroy_wq:
+        destroy_workqueue(host->mmc_omap_wq);
 err_plat_cleanup:
         if (pdata->cleanup)
                 pdata->cleanup(&pdev->dev);