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authorLinus Torvalds <torvalds@linux-foundation.org>2021-12-11 09:09:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-12-11 09:09:59 -0800
commitbd66be54b92e66d6e27af4b57407052edbed7178 (patch)
treeedaae56ebbb7664f5f0af61d6898714f67266a25 /drivers
parent2acdaf59e5958a96500b035830384168dbbe099e (diff)
parenta74c313aca266fab0d1d1a72becbb8b7b5286b6e (diff)
Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang: "Two more I2C driver bugfixes" * 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: mpc: Use atomic read and fix break condition i2c: virtio: fix completion handling
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/busses/i2c-mpc.c2
-rw-r--r--drivers/i2c/busses/i2c-virtio.c32
2 files changed, 13 insertions, 21 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index a6ea1eb1394e..53b8da6dbb23 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -636,7 +636,7 @@ static irqreturn_t mpc_i2c_isr(int irq, void *dev_id)
status = readb(i2c->base + MPC_I2C_SR);
if (status & CSR_MIF) {
/* Wait up to 100us for transfer to properly complete */
- readb_poll_timeout(i2c->base + MPC_I2C_SR, status, !(status & CSR_MCF), 0, 100);
+ readb_poll_timeout_atomic(i2c->base + MPC_I2C_SR, status, status & CSR_MCF, 0, 100);
writeb(0, i2c->base + MPC_I2C_SR);
mpc_i2c_do_intr(i2c, status);
return IRQ_HANDLED;
diff --git a/drivers/i2c/busses/i2c-virtio.c b/drivers/i2c/busses/i2c-virtio.c
index 95378780da6d..41eb0dcc3204 100644
--- a/drivers/i2c/busses/i2c-virtio.c
+++ b/drivers/i2c/busses/i2c-virtio.c
@@ -22,24 +22,24 @@
/**
* struct virtio_i2c - virtio I2C data
* @vdev: virtio device for this controller
- * @completion: completion of virtio I2C message
* @adap: I2C adapter for this controller
* @vq: the virtio virtqueue for communication
*/
struct virtio_i2c {
struct virtio_device *vdev;
- struct completion completion;
struct i2c_adapter adap;
struct virtqueue *vq;
};
/**
* struct virtio_i2c_req - the virtio I2C request structure
+ * @completion: completion of virtio I2C message
* @out_hdr: the OUT header of the virtio I2C message
* @buf: the buffer into which data is read, or from which it's written
* @in_hdr: the IN header of the virtio I2C message
*/
struct virtio_i2c_req {
+ struct completion completion;
struct virtio_i2c_out_hdr out_hdr ____cacheline_aligned;
uint8_t *buf ____cacheline_aligned;
struct virtio_i2c_in_hdr in_hdr ____cacheline_aligned;
@@ -47,9 +47,11 @@ struct virtio_i2c_req {
static void virtio_i2c_msg_done(struct virtqueue *vq)
{
- struct virtio_i2c *vi = vq->vdev->priv;
+ struct virtio_i2c_req *req;
+ unsigned int len;
- complete(&vi->completion);
+ while ((req = virtqueue_get_buf(vq, &len)))
+ complete(&req->completion);
}
static int virtio_i2c_prepare_reqs(struct virtqueue *vq,
@@ -62,6 +64,8 @@ static int virtio_i2c_prepare_reqs(struct virtqueue *vq,
for (i = 0; i < num; i++) {
int outcnt = 0, incnt = 0;
+ init_completion(&reqs[i].completion);
+
/*
* Only 7-bit mode supported for this moment. For the address
* format, Please check the Virtio I2C Specification.
@@ -106,21 +110,15 @@ static int virtio_i2c_complete_reqs(struct virtqueue *vq,
struct virtio_i2c_req *reqs,
struct i2c_msg *msgs, int num)
{
- struct virtio_i2c_req *req;
bool failed = false;
- unsigned int len;
int i, j = 0;
for (i = 0; i < num; i++) {
- /* Detach the ith request from the vq */
- req = virtqueue_get_buf(vq, &len);
+ struct virtio_i2c_req *req = &reqs[i];
- /*
- * Condition req == &reqs[i] should always meet since we have
- * total num requests in the vq. reqs[i] can never be NULL here.
- */
- if (!failed && (WARN_ON(req != &reqs[i]) ||
- req->in_hdr.status != VIRTIO_I2C_MSG_OK))
+ wait_for_completion(&req->completion);
+
+ if (!failed && req->in_hdr.status != VIRTIO_I2C_MSG_OK)
failed = true;
i2c_put_dma_safe_msg_buf(reqs[i].buf, &msgs[i], !failed);
@@ -156,12 +154,8 @@ static int virtio_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
* remote here to clear the virtqueue, so we can try another set of
* messages later on.
*/
-
- reinit_completion(&vi->completion);
virtqueue_kick(vq);
- wait_for_completion(&vi->completion);
-
count = virtio_i2c_complete_reqs(vq, reqs, msgs, count);
err_free:
@@ -210,8 +204,6 @@ static int virtio_i2c_probe(struct virtio_device *vdev)
vdev->priv = vi;
vi->vdev = vdev;
- init_completion(&vi->completion);
-
ret = virtio_i2c_setup_vqs(vi);
if (ret)
return ret;