Fixes: https://bugs.linaro.org/show_bug.cgi?id=3903

LTP Functional tests have caused a bad paging request when triggering the regmap_read_debugfs() logic of the device PMIC Hi6553 (reading regmap/f8000000.pmic/registers file during read_all test):

Unable to handle kernel paging request at virtual address ffff0 [ffff00000984e000] pgd=0000000077ffe803, pud=0000000077ffd803,0 Internal error: Oops: 96000007 [#1] SMP ... Hardware name: HiKey Development Board (DT) ... Call trace: regmap_mmio_read8+0x24/0x40 regmap_mmio_read+0x48/0x70 _regmap_bus_reg_read+0x38/0x48 _regmap_read+0x68/0x170 regmap_read+0x50/0x78 regmap_read_debugfs+0x1a0/0x308 regmap_map_read_file+0x48/0x58 full_proxy_read+0x68/0x98 __vfs_read+0x48/0x80 vfs_read+0x94/0x150 SyS_read+0x6c/0xd8 el0_svc_naked+0x30/0x34 Code: aa1e03e0 d503201f f9400280 8b334000 (39400000)

Investigations have showed that, when triggered by debugfs read() handler, the mmio regmap logic was reading a bigger (16k) register area than the one mapped by devm_ioremap_resource() during hi655x-pmic probe time (4k).

This commit changes hi655x's max register, according to HW specs, to be the same as the one declared in the pmic device in hi6220's dts, fixing the issue.

Signed-off-by: Rafael David Tinoco rafael.tinoco@linaro.org Cc: stable@vger.kernel.org #v4.9 #v4.14 #v4.16 #v4.17 --- drivers/mfd/hi655x-pmic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/hi655x-pmic.c b/drivers/mfd/hi655x-pmic.c index c37ccbfd52f2..96c07fa1802a 100644 --- a/drivers/mfd/hi655x-pmic.c +++ b/drivers/mfd/hi655x-pmic.c @@ -49,7 +49,7 @@ static struct regmap_config hi655x_regmap_config = { .reg_bits = 32, .reg_stride = HI655X_STRIDE, .val_bits = 8, - .max_register = HI655X_BUS_ADDR(0xFFF), + .max_register = HI655X_BUS_ADDR(0x400) - HI655X_STRIDE, };

static struct resource pwrkey_resources[] = {