Mismatch in probe platform_set_drvdata set's and method's that call dev_get_platdata will result in "Unable to handle kernel NULL pointer dereference", let's use according method for getting driver data after platform_set_drvdata.

8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = (ptrval) [00000000] *pgd=00000000 Internal error: Oops: 5 [#1] ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.9.10-00003-g723e101e0037-dirty #4 Hardware name: Technologic Systems TS-72xx SBC PC is at ep93xx_rtc_read_time+0xc/0x2c LR is at __rtc_read_time+0x4c/0x8c pc : [<c02b01c8>] lr : [<c02ac38c>] psr: 40000053 sp : c441dcf0 ip : c441dd50 fp : 00000000 r10: fffffdfb r9 : 00000000 r8 : c0520ca8 r7 : c149b53c r6 : c149b400 r5 : c441dd2c r4 : c149b400 r3 : 00000000 r2 : c441dd2c r1 : c441dd2c r0 : c04ea2a0 Flags: nZcv IRQs on FIQs off Mode SVC_32 ISA ARM Segment none Control: 0000717f Table: 00004000 DAC: 00000053 Process swapper (pid: 1, stack limit = 0x(ptrval)) Stack: (0xc441dcf0 to 0xc441e000) dce0: c149b400 c02ac38c 00000000 c441dd2c dd00: c149b400 c02ac3f8 c441dde4 c04ea290 c149b400 c149b400 c0520ca8 c02acc54 dd20: c400ce60 c04e5230 ffffffff 00000000 00000000 00000000 00000000 00000000 dd40: 00000000 00000000 00000000 00000000 c144f745 c144f740 00000005 c441dd7c dd60: c045c56e c0231240 00000000 c045c56f 00000004 c04e5228 c04ea290 c1496120 dd80: c04ea290 c149b400 00000000 c0520ca8 00000000 fffffdfb 00000000 c02abd80 dda0: c14967c0 c00ab884 c4400160 00000dc0 c14967c0 c4400160 00000dc0 c02ae70c ddc0: 40000053 c03b6f10 c149b400 c0265700 c14967e0 c149b400 00000000 c14967e0 dde0: c0503d44 c14967e4 00000004 c02ae754 00000000 c1496120 c04ea290 ffffffff de00: 00000000 c0520ca8 00000000 c04e5228 c1496120 c04ea290 ffffffff c0520ca8 de20: 00000000 fffffdfb 00000000 c02b028c c04ea2a0 c0503e90 00000000 c0503e90 de40: c0520ca8 c026424c c04ea2a0 00000000 00000000 c0262918 00000000 c04ea2a0 de60: c0503e90 c0502240 c050e000 c0498504 c04d5840 c0262da0 00000000 c04ea2a0 de80: c0503e90 c0262e70 c04ea2a0 c0503e90 c0262dbc c0260d44 c0502240 c4408c70 dea0: c4478440 c04e5228 c0503e90 c45b6900 00000000 c026223c c0503e90 c0261dd8 dec0: c04347ed c04347f5 c441ba60 c0503e90 c04cb99c ffffe000 00000000 c026342c dee0: c050e000 c04cb99c ffffe000 c0264210 c050e000 c04cb9ac c050e000 c000973c df00: c04466a2 c002d734 c440a480 c04b9300 c0498504 0000005c 00000006 00000006 df20: 00000000 c0498c34 0000005b c0498c34 c4400200 c440a4ef 00000000 c04e5228 df40: 00000dc0 00000006 0000005c c04e5228 c04d585c 00000007 0000005c c440a480 df60: c04d5860 c04b9ecc 00000006 00000006 00000000 c04b93e4 00000000 c04dfb50 df80: c441c000 00000000 c03b2220 00000000 00000000 00000000 00000000 00000000 dfa0: 00000000 c03b2228 00000000 c00082c0 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 [<c02b01c8>] (ep93xx_rtc_read_time) from [<c02ac38c>] (__rtc_read_time+0x4c/0x8c) [<c02ac38c>] (__rtc_read_time) from [<c02ac3f8>] (rtc_read_time+0x2c/0x4c) [<c02ac3f8>] (rtc_read_time) from [<c02acc54>] (__rtc_read_alarm+0x28/0x358) [<c02acc54>] (__rtc_read_alarm) from [<c02abd80>] (__rtc_register_device+0x124/0x2ec) [<c02abd80>] (__rtc_register_device) from [<c02b028c>] (ep93xx_rtc_probe+0xa4/0xac) [<c02b028c>] (ep93xx_rtc_probe) from [<c026424c>] (platform_drv_probe+0x24/0x5c) [<c026424c>] (platform_drv_probe) from [<c0262918>] (really_probe+0x218/0x374) [<c0262918>] (really_probe) from [<c0262da0>] (device_driver_attach+0x44/0x60) [<c0262da0>] (device_driver_attach) from [<c0262e70>] (__driver_attach+0xb4/0xc0) [<c0262e70>] (__driver_attach) from [<c0260d44>] (bus_for_each_dev+0x68/0xac) [<c0260d44>] (bus_for_each_dev) from [<c026223c>] (driver_attach+0x18/0x24) [<c026223c>] (driver_attach) from [<c0261dd8>] (bus_add_driver+0x150/0x1b4) [<c0261dd8>] (bus_add_driver) from [<c026342c>] (driver_register+0xb0/0xf4) [<c026342c>] (driver_register) from [<c0264210>] (__platform_driver_register+0x30/0x48) [<c0264210>] (__platform_driver_register) from [<c04cb9ac>] (ep93xx_rtc_driver_init+0x10/0x1c) [<c04cb9ac>] (ep93xx_rtc_driver_init) from [<c000973c>] (do_one_initcall+0x7c/0x1c0) [<c000973c>] (do_one_initcall) from [<c04b9ecc>] (kernel_init_freeable+0x168/0x1ac) [<c04b9ecc>] (kernel_init_freeable) from [<c03b2228>] (kernel_init+0x8/0xf4) [<c03b2228>] (kernel_init) from [<c00082c0>] (ret_from_fork+0x14/0x34) Exception stack(0xc441dfb0 to 0xc441dff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 Code: e12fff1e e92d4010 e590303c e1a02001 (e5933000) ---[ end trace c914d6030eaa95c8 ]---

Signed-off-by: Nikita Shubin nikita.shubin@maquefel.me Cc: stable@vger.kernel.org --- drivers/rtc/rtc-ep93xx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c index 8ec9ea1ca72e..6f90b85a5814 100644 --- a/drivers/rtc/rtc-ep93xx.c +++ b/drivers/rtc/rtc-ep93xx.c @@ -33,7 +33,7 @@ struct ep93xx_rtc { static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, unsigned short *delete) { - struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); + struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); unsigned long comp;

comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); @@ -51,7 +51,7 @@ static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,

static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) { - struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); + struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); unsigned long time;

time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); @@ -62,7 +62,7 @@ static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)

static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm) { - struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); + struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); unsigned long secs = rtc_tm_to_time64(tm);

writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);