From: Srinivas Kandagatla srinivas.kandagatla@linaro.org
[ Upstream commit b6ca770ae7f2c560a29bbd02c4e3d734fafaf804 ]
UFS drivers that probe defer will end up leaking memory allocated for clk and regulator names via kstrdup() because the structure that is holding this memory is allocated via devm_* variants which will be freed during probe defer but the names are never freed.
Use same devm_* variant of kstrdup to free the memory allocated to name when driver probe defers.
Kmemleak found around 11 leaks on Qualcomm Dragon Board RB5:
unreferenced object 0xffff66f243fb2c00 (size 128): comm "kworker/u16:0", pid 7, jiffies 4294893319 (age 94.848s) hex dump (first 32 bytes): 63 6f 72 65 5f 63 6c 6b 00 76 69 72 74 75 61 6c core_clk.virtual 2f 77 6f 72 6b 71 75 65 75 65 2f 73 63 73 69 5f /workqueue/scsi_ backtrace: [<000000006f788cd1>] slab_post_alloc_hook+0x88/0x410 [<00000000cfd1372b>] __kmalloc_track_caller+0x138/0x230 [<00000000a92ab17b>] kstrdup+0xb0/0x110 [<0000000037263ab6>] ufshcd_pltfrm_init+0x1a8/0x500 [<00000000a20a5caa>] ufs_qcom_probe+0x20/0x58 [<00000000a5e43067>] platform_probe+0x6c/0x118 [<00000000ef686e3f>] really_probe+0xc4/0x330 [<000000005b18792c>] __driver_probe_device+0x88/0x118 [<00000000a5d295e8>] driver_probe_device+0x44/0x158 [<000000007e83f58d>] __device_attach_driver+0xb4/0x128 [<000000004bfa4470>] bus_for_each_drv+0x68/0xd0 [<00000000b89a83bc>] __device_attach+0xec/0x170 [<00000000ada2beea>] device_initial_probe+0x14/0x20 [<0000000079921612>] bus_probe_device+0x9c/0xa8 [<00000000d268bf7c>] deferred_probe_work_func+0x90/0xd0 [<000000009ef64bfa>] process_one_work+0x29c/0x788 unreferenced object 0xffff66f243fb2c80 (size 128): comm "kworker/u16:0", pid 7, jiffies 4294893319 (age 94.848s) hex dump (first 32 bytes): 62 75 73 5f 61 67 67 72 5f 63 6c 6b 00 00 00 00 bus_aggr_clk.... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
With this patch no memory leaks are reported.
Link: https://lore.kernel.org/r/20210914092214.6468-1-srinivas.kandagatla@linaro.o... Fixes: aa4976130934 ("ufs: Add regulator enable support") Fixes: c6e79dacd86f ("ufs: Add clock initialization support") Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/ufs/ufshcd-pltfrm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c index 8859c13f4e091..eaeae83b999fd 100644 --- a/drivers/scsi/ufs/ufshcd-pltfrm.c +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c @@ -91,7 +91,7 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba)
clki->min_freq = clkfreq[i]; clki->max_freq = clkfreq[i+1]; - clki->name = kstrdup(name, GFP_KERNEL); + clki->name = devm_kstrdup(dev, name, GFP_KERNEL); if (!strcmp(name, "ref_clk")) clki->keep_link_active = true; dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz", @@ -126,7 +126,7 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name, if (!vreg) return -ENOMEM;
- vreg->name = kstrdup(name, GFP_KERNEL); + vreg->name = devm_kstrdup(dev, name, GFP_KERNEL);
snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name); if (of_property_read_u32(np, prop_name, &vreg->max_uA)) {