[PATCH] uio_hv_generic: Add a check for HV_NIC for send, receive buffers setup

[Naman Jain <namjain@xxxxxxxxxxxxxxxxxxx>]

Support for send and receive buffers was added for networking usecases
in UIO devices. There is no known usecase of these buffers for devices
other than HV_NIC. Add a check for HV_NIC in probe function to avoid
memory allocation and GPADL setup which would save 47 MB memory per
device type.

While at it, fix some of the syntax related issues in the touched code
which are reported by "--strict" option of checkpatch.

Signed-off-by: Naman Jain <namjain@xxxxxxxxxxxxxxxxxxx>
---
 drivers/uio/uio_hv_generic.c | 86 ++++++++++++++++++------------------
 1 file changed, 43 insertions(+), 43 deletions(-)

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index 3976360d0096..1b19b5647495 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -296,51 +296,51 @@ hv_uio_probe(struct hv_device *dev,
 	pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE;
 	pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
 
-	pdata->recv_buf = vzalloc(RECV_BUFFER_SIZE);
-	if (pdata->recv_buf == NULL) {
-		ret = -ENOMEM;
-		goto fail_free_ring;
+	if (channel->device_id == HV_NIC) {
+		pdata->recv_buf = vzalloc(RECV_BUFFER_SIZE);
+		if (!pdata->recv_buf) {
+			ret = -ENOMEM;
+			goto fail_free_ring;
+		}
+
+		ret = vmbus_establish_gpadl(channel, pdata->recv_buf,
+					    RECV_BUFFER_SIZE, &pdata->recv_gpadl);
+		if (ret) {
+			if (!pdata->recv_gpadl.decrypted)
+				vfree(pdata->recv_buf);
+			goto fail_close;
+		}
+
+		/* put Global Physical Address Label in name */
+		snprintf(pdata->recv_name, sizeof(pdata->recv_name),
+			 "recv:%u", pdata->recv_gpadl.gpadl_handle);
+		pdata->info.mem[RECV_BUF_MAP].name = pdata->recv_name;
+		pdata->info.mem[RECV_BUF_MAP].addr = (uintptr_t)pdata->recv_buf;
+		pdata->info.mem[RECV_BUF_MAP].size = RECV_BUFFER_SIZE;
+		pdata->info.mem[RECV_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
+
+		pdata->send_buf = vzalloc(SEND_BUFFER_SIZE);
+		if (!pdata->send_buf) {
+			ret = -ENOMEM;
+			goto fail_close;
+		}
+
+		ret = vmbus_establish_gpadl(channel, pdata->send_buf,
+					    SEND_BUFFER_SIZE, &pdata->send_gpadl);
+		if (ret) {
+			if (!pdata->send_gpadl.decrypted)
+				vfree(pdata->send_buf);
+			goto fail_close;
+		}
+
+		snprintf(pdata->send_name, sizeof(pdata->send_name),
+			 "send:%u", pdata->send_gpadl.gpadl_handle);
+		pdata->info.mem[SEND_BUF_MAP].name = pdata->send_name;
+		pdata->info.mem[SEND_BUF_MAP].addr = (uintptr_t)pdata->send_buf;
+		pdata->info.mem[SEND_BUF_MAP].size = SEND_BUFFER_SIZE;
+		pdata->info.mem[SEND_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
 	}
 
-	ret = vmbus_establish_gpadl(channel, pdata->recv_buf,
-				    RECV_BUFFER_SIZE, &pdata->recv_gpadl);
-	if (ret) {
-		if (!pdata->recv_gpadl.decrypted)
-			vfree(pdata->recv_buf);
-		goto fail_close;
-	}
-
-	/* put Global Physical Address Label in name */
-	snprintf(pdata->recv_name, sizeof(pdata->recv_name),
-		 "recv:%u", pdata->recv_gpadl.gpadl_handle);
-	pdata->info.mem[RECV_BUF_MAP].name = pdata->recv_name;
-	pdata->info.mem[RECV_BUF_MAP].addr
-		= (uintptr_t)pdata->recv_buf;
-	pdata->info.mem[RECV_BUF_MAP].size = RECV_BUFFER_SIZE;
-	pdata->info.mem[RECV_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
-
-	pdata->send_buf = vzalloc(SEND_BUFFER_SIZE);
-	if (pdata->send_buf == NULL) {
-		ret = -ENOMEM;
-		goto fail_close;
-	}
-
-	ret = vmbus_establish_gpadl(channel, pdata->send_buf,
-				    SEND_BUFFER_SIZE, &pdata->send_gpadl);
-	if (ret) {
-		if (!pdata->send_gpadl.decrypted)
-			vfree(pdata->send_buf);
-		goto fail_close;
-	}
-
-	snprintf(pdata->send_name, sizeof(pdata->send_name),
-		 "send:%u", pdata->send_gpadl.gpadl_handle);
-	pdata->info.mem[SEND_BUF_MAP].name = pdata->send_name;
-	pdata->info.mem[SEND_BUF_MAP].addr
-		= (uintptr_t)pdata->send_buf;
-	pdata->info.mem[SEND_BUF_MAP].size = SEND_BUFFER_SIZE;
-	pdata->info.mem[SEND_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
-
 	pdata->info.priv = pdata;
 	pdata->device = dev;
 

base-commit: 85a2dd7d7c8152cb125712a1ecae1d0a6ccac250
-- 
2.25.1