From: Wolfram Sang <wsa@kernel.org>
To: Hanna Hawa <hhhawa@amazon.com>
Cc: jarkko.nikula@linux.intel.com, andriy.shevchenko@linux.intel.com,
mika.westerberg@linux.intel.com, jsd@semihalf.com,
linus.walleij@linaro.org, ben-linux@fluff.org,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
dwmw@amazon.co.uk, benh@amazon.com, ronenk@amazon.com,
talel@amazon.com, jonnyc@amazon.com, hanochu@amazon.com,
farbere@amazon.com, itamark@amazon.com, lareine@amazon.com
Subject: Re: [PATCH v5 1/1] i2c: designware: use casting of u64 in clock multiplication to avoid overflow
Date: Mon, 9 Jan 2023 13:07:49 +0100 [thread overview]
Message-ID: <Y7wDlaOX8f9LhkCI@ninjato> (raw)
In-Reply-To: <20221221195900.23276-1-hhhawa@amazon.com>
[-- Attachment #1: Type: text/plain, Size: 771 bytes --]
On Wed, Dec 21, 2022 at 07:59:00PM +0000, Hanna Hawa wrote:
> From: Lareine Khawaly <lareine@amazon.com>
>
> In functions i2c_dw_scl_lcnt() and i2c_dw_scl_hcnt() may have overflow
> by depending on the values of the given parameters including the ic_clk.
> For example in our use case where ic_clk is larger than one million,
> multiplication of ic_clk * 4700 will result in 32 bit overflow.
>
> Add cast of u64 to the calculation to avoid multiplication overflow, and
> use the corresponding define for divide.
>
> Fixes: 2373f6b9744d ("i2c-designware: split of i2c-designware.c into core and bus specific parts")
> Signed-off-by: Lareine Khawaly <lareine@amazon.com>
> Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
Applied to for-current, thanks!
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
prev parent reply other threads:[~2023-01-09 12:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-21 19:59 [PATCH v5 1/1] i2c: designware: use casting of u64 in clock multiplication to avoid overflow Hanna Hawa
2022-12-21 20:07 ` Andy Shevchenko
2022-12-22 15:14 ` Jarkko Nikula
2023-01-09 12:07 ` Wolfram Sang [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Y7wDlaOX8f9LhkCI@ninjato \
--to=wsa@kernel.org \
--cc=andriy.shevchenko@linux.intel.com \
--cc=ben-linux@fluff.org \
--cc=benh@amazon.com \
--cc=dwmw@amazon.co.uk \
--cc=farbere@amazon.com \
--cc=hanochu@amazon.com \
--cc=hhhawa@amazon.com \
--cc=itamark@amazon.com \
--cc=jarkko.nikula@linux.intel.com \
--cc=jonnyc@amazon.com \
--cc=jsd@semihalf.com \
--cc=lareine@amazon.com \
--cc=linus.walleij@linaro.org \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mika.westerberg@linux.intel.com \
--cc=ronenk@amazon.com \
--cc=talel@amazon.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.