linux-kernel - [PATCH] HID: bpf: drop unneeded casts discarding const

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Message-Id: <20241127-hid-bpf-cast-v1-1-f26424960e84@weissschuh.net>
Date: Wed, 27 Nov 2024 17:42:47 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <bentiss@...nel.org>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 bpf@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] HID: bpf: drop unneeded casts discarding const

In commit 33c0fb85b571 ("HID: bpf: make part of struct hid_device writable")
the const qualifier was dropped from struct hid_bpf_ctx::hid.
The casts are now unnecessary.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/hid/bpf/hid_bpf_dispatch.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 961b7f35aa673618abbb7bf2edc18cd3ef7c90f4..ec950f8164e20192dd2ddb7753af19cca6c1a036 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -352,7 +352,6 @@ __hid_bpf_hw_check_params(struct hid_bpf_ctx *ctx, __u8 *buf, size_t *buf__sz,
 {
 	struct hid_report_enum *report_enum;
 	struct hid_report *report;
-	struct hid_device *hdev;
 	u32 report_len;
 
 	/* check arguments */
@@ -371,9 +370,7 @@ __hid_bpf_hw_check_params(struct hid_bpf_ctx *ctx, __u8 *buf, size_t *buf__sz,
 	if (*buf__sz < 1)
 		return -EINVAL;
 
-	hdev = (struct hid_device *)ctx->hid; /* discard const */
-
-	report_enum = hdev->report_enum + rtype;
+	report_enum = ctx->hid->report_enum + rtype;
 	report = hid_ops->hid_get_report(report_enum, buf);
 	if (!report)
 		return -EINVAL;
@@ -402,7 +399,6 @@ hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
 		   enum hid_report_type rtype, enum hid_class_request reqtype)
 {
 	struct hid_bpf_ctx_kern *ctx_kern;
-	struct hid_device *hdev;
 	size_t size = buf__sz;
 	u8 *dma_data;
 	int ret;
@@ -429,13 +425,11 @@ hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
 		return -EINVAL;
 	}
 
-	hdev = (struct hid_device *)ctx->hid; /* discard const */
-
 	dma_data = kmemdup(buf, size, GFP_KERNEL);
 	if (!dma_data)
 		return -ENOMEM;
 
-	ret = hid_ops->hid_hw_raw_request(hdev,
+	ret = hid_ops->hid_hw_raw_request(ctx->hid,
 					      dma_data[0],
 					      dma_data,
 					      size,
@@ -464,7 +458,6 @@ __bpf_kfunc int
 hid_bpf_hw_output_report(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz)
 {
 	struct hid_bpf_ctx_kern *ctx_kern;
-	struct hid_device *hdev;
 	size_t size = buf__sz;
 	u8 *dma_data;
 	int ret;
@@ -478,13 +471,11 @@ hid_bpf_hw_output_report(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz)
 	if (ret)
 		return ret;
 
-	hdev = (struct hid_device *)ctx->hid; /* discard const */
-
 	dma_data = kmemdup(buf, size, GFP_KERNEL);
 	if (!dma_data)
 		return -ENOMEM;
 
-	ret = hid_ops->hid_hw_output_report(hdev, dma_data, size, (u64)(long)ctx, true);
+	ret = hid_ops->hid_hw_output_report(ctx->hid, dma_data, size, (u64)(long)ctx, true);
 
 	kfree(dma_data);
 	return ret;

---
base-commit: aaf20f870da056752f6386693cc0d8e25421ef35
change-id: 20241127-hid-bpf-cast-e32648f6b8f7

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>