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authorJon Hunter <jon-hunter@ti.com>2013-02-11 14:26:19 -0600
committerSamuel Ortiz <sameo@linux.intel.com>2013-02-14 00:26:28 +0100
commit1765dbccaa5aa2db7b53dc765f0e636591876c03 (patch)
tree48f89502b987ea01393e20754fcfb27d25ac874b /drivers/mfd
parent6ed8b0400c74adfcbc24ea9e59878c273ef51333 (diff)
mfd: twl-core: Fix kernel panic on boot
Commit 8a6aaa3 (mfd: twl-core: Collect global variables behind one private structure (global)) removed the variable "inuse" that is used to determine if the device has been initialised and now use the twl_priv structure instead. This is causing the kernel to panic on OMAP3+ devices using the twl driver, because we try to access the twl_priv->ready member before checking if twl_priv is initialised. Fix this and move this test to the beginning of the twl_i2c_read/write function because twl_get_last_module() also uses the twl_priv structure. Signed-off-by: Jon Hunter <jon-hunter@ti.com> Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/twl-core.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 557f9ee5ec1..89ab4d97064 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -316,12 +316,12 @@ int twl_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
int sid;
struct twl_client *twl;
- if (unlikely(mod_no >= twl_get_last_module())) {
- pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
+ if (unlikely(!twl_priv || !twl_priv->ready)) {
+ pr_err("%s: not initialized\n", DRIVER_NAME);
return -EPERM;
}
- if (unlikely(!twl_priv->ready)) {
- pr_err("%s: not initialized\n", DRIVER_NAME);
+ if (unlikely(mod_no >= twl_get_last_module())) {
+ pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
return -EPERM;
}
@@ -355,12 +355,12 @@ int twl_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
int sid;
struct twl_client *twl;
- if (unlikely(mod_no >= twl_get_last_module())) {
- pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
+ if (unlikely(!twl_priv || !twl_priv->ready)) {
+ pr_err("%s: not initialized\n", DRIVER_NAME);
return -EPERM;
}
- if (unlikely(!twl_priv->ready)) {
- pr_err("%s: not initialized\n", DRIVER_NAME);
+ if (unlikely(mod_no >= twl_get_last_module())) {
+ pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
return -EPERM;
}