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authorRussell King <rmk+kernel@armlinux.org.uk>2016-08-31 10:49:46 +0300
committerRussell King <rmk+kernel@armlinux.org.uk>2016-09-22 11:39:00 +0300
commit6ac95d821216f3baab16821a893d52ab385824be (patch)
tree8183c33b98ba4f77168b1f6e9d26cab1998fe0a5 /drivers/pcmcia
parent535e0abc0534b139b067d496bb93663acffb72ce (diff)
downloadlinux-6ac95d821216f3baab16821a893d52ab385824be.tar.xz
pcmcia: soc_common: restore previous socket state on error
If an attempt to set a socket state returns an error, restore the previous socket state. If restoring the previous socket state fails, warn about this. This allows us to have simple error handling in the socket state configuration handlers - there is no need for every handler implementation to manually undo the updates, which can be complex when regulators are involved. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'drivers/pcmcia')
-rw-r--r--drivers/pcmcia/soc_common.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index f7721274cfba..9373d997d0cf 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -286,6 +286,14 @@ static int soc_common_pcmcia_config_skt(
int ret;
ret = skt->ops->configure_socket(skt, state);
+ if (ret < 0) {
+ pr_err("soc_common_pcmcia: unable to configure socket %d\n",
+ skt->nr);
+ /* restore the previous state */
+ WARN_ON(skt->ops->configure_socket(skt, &skt->cs_state));
+ return ret;
+ }
+
if (ret == 0) {
struct gpio_desc *descs[2];
int values[2], n = 0;
@@ -318,10 +326,6 @@ static int soc_common_pcmcia_config_skt(
skt->cs_state = *state;
}
- if (ret < 0)
- printk(KERN_ERR "soc_common_pcmcia: unable to configure "
- "socket %d\n", skt->nr);
-
return ret;
}
@@ -770,6 +774,8 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
{
int ret;
+ skt->cs_state = dead_socket;
+
setup_timer(&skt->poll_timer, soc_common_pcmcia_poll_event,
(unsigned long)skt);
skt->poll_timer.expires = jiffies + SOC_PCMCIA_POLL_PERIOD;