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authorTony Lindgren <tony@atomide.com>2017-10-16 14:06:14 -0700
committerWolfram Sang <wsa@the-dreams.de>2017-10-18 00:19:26 +0200
commit883b3b6567bfc8b5da7b3f0cec80513af111d2f5 (patch)
treeec468043d0aca390acac39a1488e4b83ddf9e4c2
parent88fa2dfb075a20c3464e3d303c57dd8ced9e8309 (diff)
downloadlinux-883b3b6567bfc8b5da7b3f0cec80513af111d2f5.tar.gz
i2c: omap: Fix error handling for clk_get()
Otherwise we can get the following if the fck alias is missing: Unable to handle kernel paging request at virtual address fffffffe ... PC is at clk_get_rate+0x8/0x10 LR is at omap_i2c_probe+0x278/0x6ec ... [<c056eb08>] (clk_get_rate) from [<c06f4f08>] (omap_i2c_probe+0x278/0x6ec) [<c06f4f08>] (omap_i2c_probe) from [<c0610944>] (platform_drv_probe+0x50/0xb0) [<c0610944>] (platform_drv_probe) from [<c060e900>] (driver_probe_device+0x264/0x2ec) [<c060e900>] (driver_probe_device) from [<c060cda0>] (bus_for_each_drv+0x70/0xb8) [<c060cda0>] (bus_for_each_drv) from [<c060e5b0>] (__device_attach+0xcc/0x13c) [<c060e5b0>] (__device_attach) from [<c060db10>] (bus_probe_device+0x88/0x90) [<c060db10>] (bus_probe_device) from [<c060df68>] (deferred_probe_work_func+0x4c/0x14c) Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
-rw-r--r--drivers/i2c/busses/i2c-omap.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 1ebb5e947e0b..23c2ea2baedc 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -360,6 +360,7 @@ static int omap_i2c_init(struct omap_i2c_dev *omap)
unsigned long fclk_rate = 12000000;
unsigned long internal_clk = 0;
struct clk *fclk;
+ int error;
if (omap->rev >= OMAP_I2C_REV_ON_3430_3530) {
/*
@@ -378,6 +379,13 @@ static int omap_i2c_init(struct omap_i2c_dev *omap)
* do this bit unconditionally.
*/
fclk = clk_get(omap->dev, "fck");
+ if (IS_ERR(fclk)) {
+ error = PTR_ERR(fclk);
+ dev_err(omap->dev, "could not get fck: %i\n", error);
+
+ return error;
+ }
+
fclk_rate = clk_get_rate(fclk);
clk_put(fclk);
@@ -410,6 +418,12 @@ static int omap_i2c_init(struct omap_i2c_dev *omap)
else
internal_clk = 4000;
fclk = clk_get(omap->dev, "fck");
+ if (IS_ERR(fclk)) {
+ error = PTR_ERR(fclk);
+ dev_err(omap->dev, "could not get fck: %i\n", error);
+
+ return error;
+ }
fclk_rate = clk_get_rate(fclk) / 1000;
clk_put(fclk);