clk_disable_unprepare in remove causes an imbalance and hence gives the below crash on module remove. While at it also remove some duplicate code from probe. / $ rmmod i2c-exynos5 [ 6.996374] ------------[ cut here ]------------ [ 6.999523] WARNING: CPU: 2 PID: 1137 at drivers/clk/clk.c:842 clk_disable+0x18/0x24() [ 7.007403] Modules linked in: i2c_exynos5(-) [ 7.011747] CPU: 2 PID: 1137 Comm: rmmod Not tainted 3.12.0-next-20131105-00083-g16f4799-dirty #21 [ 7.020696] [<c0014e0c>] (unwind_backtrace+0x0/0xf4) from [<c0011784>] (show_stack+0x10/0x14) [ 7.029190] [<c0011784>] (show_stack+0x10/0x14) from [<c037acd4>] (dump_stack+0x7c/0xb0) [ 7.037255] [<c037acd4>] (dump_stack+0x7c/0xb0) from [<c001e0ac>] (warn_slowpath_common+0x6c/0x88) [ 7.046190] [<c001e0ac>] (warn_slowpath_common+0x6c/0x88) from [<c001e164>] (warn_slowpath_null+0x1c/0x24) [ 7.055818] [<c001e164>] (warn_slowpath_null+0x1c/0x24) from [<c02dcde4>] (clk_disable+0x18/0x24) [ 7.064670] [<c02dcde4>] (clk_disable+0x18/0x24) from [<bf0002d4>] (exynos5_i2c_remove+0x1c/0x34 [i2c_exynos5]) [ 7.074736] [<bf0002d4>] (exynos5_i2c_remove+0x1c/0x34 [i2c_exynos5]) from [<c02274a8>] (__device_release_driver+0x58/0xb0) [ 7.085836] [<c02274a8>] (__device_release_driver+0x58/0xb0) from [<c0227b88>] (driver_detach+0xac/0xb0) [ 7.095291] [<c0227b88>] (driver_detach+0xac/0xb0) from [<c02271c0>] (bus_remove_driver+0x4c/0xa0) [ 7.104227] [<c02271c0>] (bus_remove_driver+0x4c/0xa0) from [<c00725dc>] (SyS_delete_module+0x124/0x194) [ 7.113682] [<c00725dc>] (SyS_delete_module+0x124/0x194) from [<c000e2e0>] (ret_fast_syscall+0x0/0x30) [ 7.122957] ---[ end trace 23bb6e4e0bf52196 ]--- [ 7.127591] ------------[ cut here ]------------ [ 7.132187] WARNING: CPU: 2 PID: 1137 at drivers/clk/clk.c:751 clk_unprepare+0x14/0x1c() [ 7.140259] Modules linked in: i2c_exynos5(-) [ 7.144560] CPU: 2 PID: 1137 Comm: rmmod Tainted: G W 3.12.0-next-20131105-00083-g16f4799-dirty #21 [ 7.154493] [<c0014e0c>] (unwind_backtrace+0x0/0xf4) from [<c0011784>] (show_stack+0x10/0x14) [ 7.163006] [<c0011784>] (show_stack+0x10/0x14) from [<c037acd4>] (dump_stack+0x7c/0xb0) [ 7.171052] [<c037acd4>] (dump_stack+0x7c/0xb0) from [<c001e0ac>] (warn_slowpath_common+0x6c/0x88) [ 7.179984] [<c001e0ac>] (warn_slowpath_common+0x6c/0x88) from [<c001e164>] (warn_slowpath_null+0x1c/0x24) [ 7.189616] [<c001e164>] (warn_slowpath_null+0x1c/0x24) from [<c02ddcc4>] (clk_unprepare+0x14/0x1c) [ 7.198639] [<c02ddcc4>] (clk_unprepare+0x14/0x1c) from [<bf0002dc>] (exynos5_i2c_remove+0x24/0x34 [i2c_exynos5]) [ 7.208876] [<bf0002dc>] (exynos5_i2c_remove+0x24/0x34 [i2c_exynos5]) from [<c02274a8>] (__device_release_driver+0x58/0xb0) [ 7.219978] [<c02274a8>] (__device_release_driver+0x58/0xb0) from [<c0227b88>] (driver_detach+0xac/0xb0) [ 7.229434] [<c0227b88>] (driver_detach+0xac/0xb0) from [<c02271c0>] (bus_remove_driver+0x4c/0xa0) [ 7.238369] [<c02271c0>] (bus_remove_driver+0x4c/0xa0) from [<c00725dc>] (SyS_delete_module+0x124/0x194) [ 7.247824] [<c00725dc>] (SyS_delete_module+0x124/0x194) from [<c000e2e0>] (ret_fast_syscall+0x0/0x30) [ 7.257104] ---[ end trace 23bb6e4e0bf52197 ]--- Signed-off-by: Sachin Kamat <sachin.kamat@xxxxxxxxxx> Cc: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx> --- drivers/i2c/busses/i2c-exynos5.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c index d419300..c1ef228 100644 --- a/drivers/i2c/busses/i2c-exynos5.c +++ b/drivers/i2c/busses/i2c-exynos5.c @@ -702,10 +702,6 @@ static int exynos5_i2c_probe(struct platform_device *pdev) platform_set_drvdata(pdev, i2c); - clk_disable_unprepare(i2c->clk); - - return 0; - err_clk: clk_disable_unprepare(i2c->clk); return ret; @@ -716,7 +712,6 @@ static int exynos5_i2c_remove(struct platform_device *pdev) struct exynos5_i2c *i2c = platform_get_drvdata(pdev); i2c_del_adapter(&i2c->adap); - clk_disable_unprepare(i2c->clk); return 0; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
