linux-kernel - [PATCH 20/22] HID: intel-ish-hid: Use dma_alloc

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Date:   Sat, 19 Feb 2022 08:52:19 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org, hch@....de,
        cl@...ux.com, 42.hyeyoo@...il.com, penberg@...nel.org,
        rientjes@...gle.com, iamjoonsoo.kim@....com, vbabka@...e.cz,
        David.Laight@...LAB.COM, david@...hat.com,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        linux-crypto@...r.kernel.org, steffen.klassert@...unet.com,
        netdev@...r.kernel.org, hca@...ux.ibm.com, gor@...ux.ibm.com,
        agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com,
        svens@...ux.ibm.com, linux-s390@...r.kernel.org, michael@...le.cc,
        linux-i2c@...r.kernel.org, wsa@...nel.org
Subject: [PATCH 20/22] HID: intel-ish-hid: Use dma_alloc_noncoherent() for dma buffer

GFP_DMA32 is an illegal flag to pass when calling kmalloc(), please see
GFP_SLAB_BUG_MASK definition.

Allocating dma buffer using kmalloc() is not recommended. Use
dma_alloc_noncoherent() instead. DMA API will assume the device has
32 bit addressing limitation when allocating buffer.

[ 42.hyeyoo@...il.com: Use dma_alloc_noncoherent() instead of
  __get_free_pages ]

Signed-off-by: Baoquan He <bhe@...hat.com>
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: Jiri Kosina <jikos@...nel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: christian.koenig@....com
Cc: linux-input@...r.kernel.org
---
 drivers/hid/intel-ish-hid/ishtp-fw-loader.c | 23 +++++++--------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/hid/intel-ish-hid/ishtp-fw-loader.c b/drivers/hid/intel-ish-hid/ishtp-fw-loader.c
index e24988586710..3be1e3329962 100644
--- a/drivers/hid/intel-ish-hid/ishtp-fw-loader.c
+++ b/drivers/hid/intel-ish-hid/ishtp-fw-loader.c
@@ -661,21 +661,15 @@ static int ish_fw_xfer_direct_dma(struct ishtp_cl_data *client_data,
 	 */
 	payload_max_size &= ~(L1_CACHE_BYTES - 1);
 
-	dma_buf = kmalloc(payload_max_size, GFP_KERNEL | GFP_DMA32);
+	dma_buf = dma_alloc_noncoherent(devc, get_order(payload_max_size),
+				        &dma_buf_phy, DMA_TO_DEVICE,
+					GFP_KERNEL);
 	if (!dma_buf) {
+		dev_err(cl_data_to_dev(client_data), "DMA alloc failed\n");
 		client_data->flag_retry = true;
 		return -ENOMEM;
 	}
 
-	dma_buf_phy = dma_map_single(devc, dma_buf, payload_max_size,
-				     DMA_TO_DEVICE);
-	if (dma_mapping_error(devc, dma_buf_phy)) {
-		dev_err(cl_data_to_dev(client_data), "DMA map failed\n");
-		client_data->flag_retry = true;
-		rv = -ENOMEM;
-		goto end_err_dma_buf_release;
-	}
-
 	ldr_xfer_dma_frag.fragment.hdr.command = LOADER_CMD_XFER_FRAGMENT;
 	ldr_xfer_dma_frag.fragment.xfer_mode = LOADER_XFER_MODE_DIRECT_DMA;
 	ldr_xfer_dma_frag.ddr_phys_addr = (u64)dma_buf_phy;
@@ -725,15 +719,14 @@ static int ish_fw_xfer_direct_dma(struct ishtp_cl_data *client_data,
 		fragment_offset += fragment_size;
 	}
 
-	dma_unmap_single(devc, dma_buf_phy, payload_max_size, DMA_TO_DEVICE);
-	kfree(dma_buf);
+	dma_free_noncoherent(devc, get_order(payload_max_size), dma_buf,
+			     dma_buf_phy, DMA_TO_DEVICE);
 	return 0;
 
 end_err_resp_buf_release:
 	/* Free ISH buffer if not done already, in error case */
-	dma_unmap_single(devc, dma_buf_phy, payload_max_size, DMA_TO_DEVICE);
-end_err_dma_buf_release:
-	kfree(dma_buf);
+	dma_free_noncoherent(devc, get_order(payload_max_size), dma_buf,
+			     dma_buf_phy, DMA_TO_DEVICE);
 	return rv;
 }
 
-- 
2.17.2