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Date: Tue, 24 Nov 2015 17:10:06 -0800 From: Jin Qian <jinqian@...roid.com> To: Greg Hackmann <ghackmann@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Yu Ning <yu.ning@...el.com>, Peter Senna Tschudin <peter.senna@...il.com>, Dan Carpenter <dan.carpenter@...cle.com>, Alex Bennée <alex.bennee@...aro.org>, Christoffer Dall <christoffer.dall@...aro.org>, Joe Perches <joe@...ches.com>, Jason Hu <jia-cheng.hu@...el.com>, linux-kernel@...r.kernel.org Cc: Jin Qian <jinqian@...roid.com> Subject: [PATCH 2/8] android_pipe: don't be clever with #define offsets From: Alex Bennée <alex.bennee@...aro.org> You just make it harder to figure out when commands are being used. Signed-off-by: Alex Bennée <alex.bennee@...aro.org> (cherry picked from commit b765d478f67a2f6cb43c40a99114ea5ff1bcff97) Signed-off-by: Jin Qian <jinqian@...roid.com> --- drivers/platform/goldfish/goldfish_pipe.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c index e7a29e2..0fb3a34 100644 --- a/drivers/platform/goldfish/goldfish_pipe.c +++ b/drivers/platform/goldfish/goldfish_pipe.c @@ -90,12 +90,6 @@ #define CMD_WRITE_BUFFER 4 /* send a user buffer to the emulator */ #define CMD_WAKE_ON_WRITE 5 /* tell the emulator to wake us when writing is possible */ - -/* The following commands are related to read operations, they must be - * listed in the same order than the corresponding write ones, since we - * will use (CMD_READ_BUFFER - CMD_WRITE_BUFFER) as a special offset - * in goldfish_pipe_read_write() below. - */ #define CMD_READ_BUFFER 6 /* receive a user buffer from the emulator */ #define CMD_WAKE_ON_READ 7 /* tell the emulator to wake us when reading * is possible */ @@ -272,8 +266,6 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, char __user *buffer, unsigned long irq_flags; struct goldfish_pipe *pipe = filp->private_data; struct goldfish_pipe_dev *dev = pipe->dev; - const int cmd_offset = is_write ? 0 - : (CMD_READ_BUFFER - CMD_WRITE_BUFFER); unsigned long address, address_end; int ret = 0; @@ -325,7 +317,8 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, char __user *buffer, /* Now, try to transfer the bytes in the current page */ spin_lock_irqsave(&dev->lock, irq_flags); - if (access_with_param(dev, CMD_WRITE_BUFFER + cmd_offset, + if (access_with_param(dev, + is_write ? CMD_WRITE_BUFFER : CMD_READ_BUFFER, address, avail, pipe, &status)) { gf_write_ptr(pipe, dev->base + PIPE_REG_CHANNEL, dev->base + PIPE_REG_CHANNEL_HIGH); @@ -333,7 +326,7 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, char __user *buffer, gf_write_ptr((void *)address, dev->base + PIPE_REG_ADDRESS, dev->base + PIPE_REG_ADDRESS_HIGH); - writel(CMD_WRITE_BUFFER + cmd_offset, + writel(is_write ? CMD_WRITE_BUFFER : CMD_READ_BUFFER, dev->base + PIPE_REG_COMMAND); status = readl(dev->base + PIPE_REG_STATUS); } @@ -370,7 +363,8 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, char __user *buffer, set_bit(wakeBit, &pipe->flags); /* Tell the emulator we're going to wait for a wake event */ - goldfish_cmd(pipe, CMD_WAKE_ON_WRITE + cmd_offset); + goldfish_cmd(pipe, + is_write ? CMD_WAKE_ON_WRITE : CMD_WAKE_ON_READ); /* Unlock the pipe, then wait for the wake signal */ mutex_unlock(&pipe->lock); -- 2.6.0.rc2.230.g3dd15c0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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